[bgpd/cleanup] Make BGP FSM table read-only static

The finite state machine table is immutable.
diff --git a/bgpd/bgp_fsm.c b/bgpd/bgp_fsm.c
index 9248573..bf4b66b 100644
--- a/bgpd/bgp_fsm.c
+++ b/bgpd/bgp_fsm.c
@@ -901,7 +901,7 @@
 }
 
 /* Finite State Machine structure */
-struct {
+static const struct {
   int (*func) (struct peer *);
   int next_state;
 } FSM [BGP_STATUS_MAX - 1][BGP_EVENTS_MAX - 1] =